Abstract
The standard molar Gibbs energies of formation of ‘Bi22Cr18O60’ and ‘Bi38CrO60’ have been determined by emf technique using solid oxide electrolyte based emf cells and are given by:ΔfGmo ‘Bi22Cr18O60’s± 9.9kJ= -15314.4 + 4.1864T / KT: 929– 1025 KΔfGmo ‘Bi38CrO60’s± 5.6kJ= -11109.7+ 4.8582T / KT: 833 - 890 KThe temperatures of appearance of these compounds as stable phases in liquid bismuth in Bi-Cr-O system were deduced from the emf measurements. Confirmation experiments were also carried out by long term equilibration studies.
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